They take ages to process the order, and actually only do it when you query the order itself. Just used Maximus this morning and it went through in about 10 seconds. And it's cheaper...
STAY AWAY from Mediawob! I used them once or twice and they where fine. Then the last time I bought a voucher from them I just got no reply for almost a week.
I escalated it to paypal and after 3 weeks with still no reply from Mediawob they refunded my money.